Sorry about you having to move inland, but life happens. Lap swimming is good. Some open water swimming or paddling in lakes, if that's a possibility, would be good too. There has been a number of swim workout regimens suggested in this and other physical conditioning threads. Some include routines for increasing one's breath-holding capacity. On non-surfing/non-running days, I used to swim laps during lunchtime at a nice Olympic size indoor pool. But it's been "awaiting parts" for a broken pipe since early spring. Really absurd how long it takes for pool repairs at the Navy base where I work. So instead I just go out for a paddle on an old, fat soft top board.